Chemical Formula: Mn++3[Mn++3Fe+++][(Si,Fe+++)4O10](OH,O)8
Help on Composition: Composition: Molecular Weight = 703.49 g
 
Hydrogen 0.57 % H 5.12 % H2O 0.00 %
Oxygen 40.94 % O 0.00 % 0.00 %
Magnesium 10.36 % Mg 17.19 % MgO 0.00 %
Silicon 15.17 % Si 32.46 % SiO2 0.00 %
Manganese 23.43 % Mn 30.25 % MnO 0.00 %
Iron 9.53 % Fe 13.62 % Fe2O3 0.00 %


100.00 % 98.64 %
 
Help on Empirical Formula: Empirical Formula: Mg3Mn2+3Fe3+Si3.8Fe3+0.2O14(OH)4
Help on Environment: Environment: Veinlets in Mn-rich skarns
Help on Locality: Locality: Langban, Varmland, Sweden.. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Forest A. Gonyer (1899-1971), chemist-analyst and mineralogist, Harvard University
Help on Synonym: Synonym: